mouseover and onclick effects for input (submit) buttons, can I do it?

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It sounds like you need support for the CSS pseudo selectors "hover" with input elements. Mozilla provides this but unfortunately IE6 does not (I didn't test Opera). The followign code provides a button which will change colour when you mouseover it in Mozilla:

Personally, I'd use CSS, and let the browsers catch up on it, especially since it's really a small part of the design.

BTW, currently Opera's support for CSS on form elements seems quite poor actually, so I wouldn't try making backgrounds and hovers work in it, ATM. Code to the standard and Opera (and other browsers) will eventually catch up. :-)